The Wingman Technique usually involves (and is best preformed with only one) friend accompanying another to a club or other social setting. If one friend finds a hot girl who is accompanied by an ugly friend (i.e. grenade), it is the sworn job and duty of the accompanying friend (the wingman) to occupy the ugly girl so his friend can get action with the hot girl. The revered duty and purpose of a wingman is to streamline the night for his friend as much as possible, tackling any obstacles and cockblocks.
A description of anal sex, which has links with the west country region of the United Kingdom.
Can also be used when being downgrading to certain induviduals.
Last night Brenada was so horny that she made me flip her over and take her up the wrong'un!
He's so ugly I think he must of been conceived up the wrong'un!